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These are instructions on how to jailbreak and unlock your iPhone 3GS on iOS 4.1 using PwnageTool 4.1.3 for Mac OS X. This tutorial will explain how to upgrade your baseband if needed for an unlock.

For iPhone 3G use this tutorial.

There is no unthethered jailbreak for new iPhone 3GS bootroms and iOS 4.2.1 yet, so you should stay at iOS 4.1.

Important: iPhone3GS users with old bootroms who want to go to 4.2.1 and unlock should not use this PwnageTool! Update to stock 4.2.1 first, then use new redsn0w to update your baseband.

Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:

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These are instructions on how to jailbreak and unlock your iPhone 3G on iOS 4.2.1 using PwnageTool 4.1.3 for Mac OS X. This tutorial will explain how to upgrade your baseband if needed for an unlock.

Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:

• PwnageTool 4.1.3 from here

You will also need the 4.2.1 iPhone firmware.

• iPhone 3G iOS 4.2.1: iPhone1,2_4.2.1_8C148_Restore.ipsw

If you are on the 05.14 or 05.15 baseband you will also need the iPad 3.2.2 firmware. You can find out your baseband version in Settings -> General -> About -> Modem Firmware.

• iPad iOS 3.2.2: iPad1,1_3.2.2_7B500_Restore.ipsw

When downloading the IPSW file, it is best to download it with Firefox since Safari often auto extracts it!

Step Two
Double click to mount PwnageTool then drag the PwnageTool icon into the Pwnage folder.

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This is the tweet from MuscleNerd posted a minute ago. So it is just minutes to wait for new unlock utility ultrasn0w.

UPDATE: New ultrasn0w released! New PwnageTool 4.1.3 released. Read carefully this post from DevTeam first, then reread again!

UPDATE 2: new ultrasn0w 1.2 supports the following basebands:

• iPhone 4: 01.59.00
• iPhone 3G/3GS: 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00.

UPDATE 3: Step-by-step Tutorial: How to Jailbreak and Unlock

• iPhone 3G Using PwnageTool 4.1.3 (Mac OS) [iOS 4.2.1]
• iPhone 3GS Using PwnageTool 4.1.3 (Mac OS) [iOS 4.1]

MuscleNerd has recently announced via tweeter that ultrasn0w unlock for iPhone is now fully working on iOS 4.2.1

Finally got ultrasn0w working fully on 4.2.1. Apple inadvertently(!) broke ultrasn0w via aggressive compiler optimization

MuscleNerd previously announced that the ultrasn0w unlock should be available by Sunday for the iPhone 3G and iPhone 3GS. The unlock for the iPhone 4 will take much more time.

UPDATE: this is not a reason for update to iOS 4.2.1, wait for utilities.

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DevTeam hacker MuscleNerd tweeted that they after releasing redsn0w jailbreak for 4.2 the team can start working on iPhone unlock. Users can expect the unlock for the iPhone 3G and iPhone 3GS this week. The iPhone 4 unlock will take more time and no concrete info is available about that yet.

The ultrasn0w unlock will be released for iOS 4.1 firmware. So is you need unlock, do not update to iOS 4.2.1.